SIR JOHN HOUGHTON, who was co-chairman of the IPCC Scientific Assessment working group from 1988 to 2002, and Director General of the UK Meteorological Office from 1983 to 1991 has recently posted on the Web a blog attacking The Great Global Warming Swindle, a programme broadcast on Channel 4 in the UK on 8 and 12 March 2007. Sir John’s attack was inaccurate and unfair. The offending passages are here presented seriatim, with explanations of Sir John’s many mistakes in each passage.